games-util/game-device-udev-rules: Apply patsub_replacement defences

Per bug #881383, string replacing forms of parameter expansion must take care
to quote - or appropriately escape - any nested parameter expansions, assuming
that their values are intended to be taken literally (as is almost invariably
the case). This has long been the case, but the introduction of the new
patsub_replacement option in bash >=5.2 has brought the issue to the fore.

In the case of the games-util/game-device-udev-rules package, the improper
quoting is not yet causing any issues. Still, it is better to write the code
properly to begin with, especially considering the demonstrative value of
robust code.

Signed-off-by: Kerin Millar <[email protected]>
Bug: https://bugs.gentoo.org/881383
Signed-off-by: Sam James <[email protected]>

games-util/game-device-udev-rules/game-device-udev-rules-20220311.ebuild

@@ -51,7 +51,7 @@ src_prepare() {
 	local SRC DEST EXTRA
 	for SRC in 60-steam-{input,vr}.rules; do
 		DEST=${SRC//steam/game}
-		EXTRA=${FILESDIR}/${DEST/./-${PV}.}
+		EXTRA=${FILESDIR}/${DEST/./-"${PV}".}
 
 		# Make changes in a copy.
 		cp -v "${SRC}" "${DEST}" || die